"Beyond devastated. Not being able to compete with my brothers each and every day is extremely disappointing," Stroman wrote Tuesday on Twitter. "Still can't believe it."

Stroman was expected to be a key piece to Toronto's starting rotation this season after a strong rookie campaign. He was 11-6 with a 3.65 ERA and 111 strikeouts over 130 2/3 innings in 26 games, including 20 starts, in 2014.